Yes to both.
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13
1573 is not prime. 1573 = 11 * 11 * 13. Thus, it is a composite number.
5291 is not prime. 5291 = 11 * 13 * 37
11 and 13 are prime numbers but 15 is a composite number because it has more than two factors
1573 is factored out as 11*11*13, so therefore it is a composite number